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12 Gauge Wire Breaker Size - I ran throughout a panel nowadays that has a water heater and a dryer established using tandem breakers. They're now not split either. This panel is configurable to 1/2 a slot, which means a normal 110vac breaker could be clipped into 2 prongs of a live bus, and there is a small plastic wall isolating the b facet from the a facet preserving you from shorting the 2 110vac circuits collectively. But, the tandem breakers have a slot cut out permitting you to plug into both facets. Each side of the tandem breaker gets its very own feed from its personal prong on the buses making 220vac.

You may in reality see the two buses and that there does not seem like any shenanigans connecting the two of them. I eliminated the top double-pole breaker for readability. The popped dryer breaker is truly a single pole, as you may see the only access slot. It is seemingly related to the left bus and handiest that bus.

The setup is working because every breaker pair feeds off the right panel bus leg (one attaches to l1, the alternative to l2). From your brought facts, each 240v circuit is split throughout the two breakers to do that.

What's wrong -- the important safety situation right here is that with a circuit fault, simplest one of the breakers in the set may journey, leaving the 240v circuit in part energized. As an example if the dryer heating coil burns through and one end touches floor, that facet will journey, leaving the opposite leg hot. You truely want a circuit fault to totally energy down both legs. Additionally related is the fact that every body not listening to the panel setup may energy off the circuit to work on it and not comprehend they switched off adjoining pairs in preference to exchange pairs of each 240v circuit, leaving a warm leg inside the circuit they think is powered down. You want things to be fail-safe. This isn't fail-safe, but is a booby lure looking forward to the inattentive or moved quickly. Nec frowns heavily on things like this.

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